Splash screen not showing on MacOS Ventura (13.0) (running on an Apple M1) and Qt 6.4.0.

TheFlyingMooseMan

Code:

    QPixmap pm(":/images/splash.png");
    QSplashScreen splash(pm);
    qDebug() << SB_DEBUG_INFO << pm.height() << pm.width();

    if(appStartUpFlag)
    {
        splash.show();
        _app->processEvents();   // defined in header:    QApplication*     _app;
        
        qDebug() << SB_DEBUG_INFO << "splash screen should show";
    }

    init();

    setupModels();

    refreshModels();

    setupUI();

    configureMenus();

    mw->setWindowTitle(mw->windowTitle() + " - " + dbm->databaseName() + " ("+Context::instance()->dataAccessLayer()->getDriverName()+")");

    _resetStatusBar();

    if(appStartUpFlag)
    {
        splash.finish(mw);
        qDebug() << SB_DEBUG_INFO << "splash screen done";
    }

Output:

0x1f4d62500 "15:47:13" ../app/Controller.cpp openMainWindow 223 splash screen should show
qt.gui.imageio: libpng warning: iCCP: known incorrect sRGB profile
qt.webenginecontext: 

GL Type: core_profile
Surface Type: OpenGL
Surface Profile: CoreProfile
Surface Version: 4.1
QSG RHI Backend: OpenGL
Using Supported QSG Backend: yes
Using Software Dynamic GL: no
Using Multithreaded OpenGL: yes

Init Parameters:
  *  application-name MezzoForta%21 
  *  browser-subprocess-path /Users/roy/Qt/6.4.2/macos/lib/QtWebEngineCore.framework/Helpers/QtWebEngineProcess.app/Contents/MacOS/QtWebEngineProcess 
  *  disable-features ConsolidatedMovementXY,InstalledApp,BackgroundFetch,WebOTP,WebPayments,WebUSB,PictureInPicture 
  *  disable-speech-api  
  *  enable-features NetworkServiceInProcess,TracingServiceInProcess 
  *  enable-threaded-compositing  
  *  in-process-gpu  
  *  use-gl core_profile 


0x1f4d62500 "15:47:20" ../app/Controller.cpp openMainWindow 263 splash screen done

Any hints are appreciated!

Thanks,
Roy

SGaist

Hi,

Please provide a minimal compilable example that shows this behaviour.

Did you check if you have the same issue with an older version of Qt ?

DerReisende

Interestingly I can confirm as well that I don't get a splash screen on my M1 MacBook. I tested Qt 6.3.2, 6.4.2 and 6.5b1 with an app that runs on windows and macOS. Qt versions are the ones from the online installer.
I don't get any warnings and delaying startup (with calls to QCoreApplication::processEvents()) doesnt help. Really strange.

DerReisende

One observation: Splash screen does NOT appear when the app is launched from within IDE (either CLion or Qt Creator tested). Splash DOES appear when the app is launched from Finder...

SGaist

What about starting it from the command line ?

DerReisende

@SGaist Yeah, direct launching the executable from CLI does not show the splash screen.

SGaist

Do you have any message coming out on the terminal that looks out of place ?

TheFlyingMooseMan

@SGaist Here is one:

#include <QApplication>
#include <QDebug>
#include <QSplashScreen>
#include <QMainWindow>

#include "ui_MainWindow.h"

#define SB_DEBUG_INFO  QThread::currentThreadId() << QTime::currentTime().toString() <<  __FILE__ << __FUNCTION__ << __LINE__

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow()
    {
        ui.setupUi(this);
    }

    Ui::MainWindow ui;
};

void
sleep(int seconds)
{
    QTime dieTime=QTime::currentTime().addSecs(seconds);
    while(QTime::currentTime()<dieTime)
    {
        QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
    }
}

void displaySpashMountain(QApplication* _app)
{
    QPixmap pm(":/images/splash.png");
    QSplashScreen splash(pm);
    qDebug() << SB_DEBUG_INFO << pm.height() << pm.width();

    splash.show();
    _app->processEvents();
    qDebug() << SB_DEBUG_INFO << "splash screen should show";


    MainWindow* mw=new MainWindow();
    qDebug() << SB_DEBUG_INFO << "sleep 10s";
    sleep(10);
    qDebug() << SB_DEBUG_INFO << "done sleep 10s";

    splash.finish(mw);
    qDebug() << SB_DEBUG_INFO << "splash screen done";


}

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    displaySpashMountain(&app);
    return 0;
}

Dariusz Maciejewski

I have updated to Ventura and immediately noticed same issue with Qt 5.15.3. The dialog that has a Qt::SplashScreen type won't show up if I start the app from CLI, but works fine when started from the Finder.

The QML logic within the invisible dialog works fine (I properly receive a signal being emitted by a timer in the dialog QML file.

Changing the dialog type to:
Qt::Dialog | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint
"solves" the issue.

TheFlyingMooseMan

@TheFlyingMooseMan @SGaist : is this enough of an example?

DerReisende

@Dariusz-Maciejewski I can confirm your workaround works here as well.

TheFlyingMooseMan

@DerReisende care to share your code? It did not work in my environment.

TheFlyingMooseMan

For all that's worth -- seems like no one seems to care anyways.
I downgraded my M1 mac mini to Big Sur and doing a fresh install (wipe out hard drive ya da ya da ...)
Splash screen is now working with exactly the same code in this configuration.
Wonder if anyone is going to react LOL :)

DerReisende

@TheFlyingMooseMan sorry didnt receive a notification that you replied to me. I am going to check if i can find the requested code again :)

DerReisende

@TheFlyingMooseMan this what I am using:

QSplashScreen splash(QPixmap(":/resources/splash.png"));
#if defined(Q_OS_MAC) && defined(Q_PROCESSOR_ARM)
#if QT_VERSION <= QT_VERSION_CHECK(6, 5, 0)
    //workaround invisible splash screen
    splash.setWindowFlags(Qt::Dialog | Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
#endif
#endif
    splash.show();

Works for me™...

TheFlyingMooseMan

FWIW (Part 2):
Upgraded to Ventura, upgraded XCode to 14.2, redownloaded Qt.
Splash screen disappeared.

Going back to Big Sur, and reupgrade to Ventura.
This time I'll not upgrade XCode, but redownload Qt.

TheFlyingMooseMan

Well, F that.
I thought macos would allow me to go back to Big Sur just using time machine.
It wants me to reinstall Big Sur and then restore from Time Machine.
Since I don't get any responses on this thread, I won't investigate any further, let other people complain about this and let the ingenious minds at Qt prioritize this and figure this out.
Fact is that something has changed in macos libraries. This something is not taken into account by Qt.
My old style HFL 0.02.

SGaist

@TheFlyingMooseMan the best way to make this known is to open a ticket on the bug report system. That way the Qt developers will be made aware of this change.

TheFlyingMooseMan

@SGaist Thanks, created: https://bugreports.qt.io/browse/QTBUG-111750

David Fokkema

I just added a comment with my observations. In particular, the main window show() method activates the Qt app. So if you run from the terminal, the call to show() is the moment the desktop's menu bar switches from 'Terminal' to 'python'. That's also the moment the splash screen shows up, briefly. This is because the splash screen's show() method does not make the app active. If you click on the dock icon of the Qt app during startup then the splash screen shows up just fine.